updateV4Checksum calculates and updates the checksum in the packet buffer for a change between old and new. The oldSum must point to the 16-bit checksum field in the packet buffer that holds the old checksum value, it will be updated in place. The old and new must be the same length, and must be an
(oldSum, old, new []byte)
source not stored for this graph (policy: none)
no outgoing calls
no test coverage detected